A man who was restrained and punched in the face by police officers died three days later from accidental causes, according to an autopsy report that pointed to his drug use.

Tawon Boyd of Middle River, Maryland, died on September 21, 2016 from multiple organ failure which was likely caused by a drug commonly called 'bath salts', according to the medical examiner's office.

The 21-year-old struggled with Baltimore County police officers after he made two 911 calls on September 18, but the autopsy report said it was 'unlikely that restraint by law enforcement caused or significantly contributed to his death'.

Tawon Boyd (pictured) died on September 21, 2016 from multiple organ failure, likely caused by a drug commonly called 'bath salts', according to the Maryland medical examiner's office

Boyd made two 911 calls on September 18 from his home on Akin Circle (pictured, general view), and a violent confrontation with responding officers ensued

Boyd made two 911 calls on September 18, and his girlfriend Deona Styron could be heard in the background saying he needed medical attention.

Boyd 'appeared to be confused and paranoid' and told responding officers there was someone in his house when there was in fact no intruder, according to a police.

His girlfriend also told officers he was acting 'crazy'.

The confrontation with police began after Boyd repeatedly banged on the door of a neighbor's home and officers tried to pull him away to keep him from going inside, according to the police report.

Police tried to talk with Boyd, but he began screaming. He also tried to enter several marked police cars and refused to obey orders to lie down and put his hands on his back.

He grabbed and kicked at the officers, injuring three, before one punched Boyd twice in the face as the young man held onto him, police said.

The confrontation lasted about five minutes, and officers held Boyd down with their arms and legs, the police report stated.

Boyd's girlfriend told officers he was acting 'crazy' and one officer punched Boyd twice in the face as the young man held onto him, police said

WHAT ARE BATH SALTS?

Bath salts, or synthetic cathinones, are a synthetic street drug made to replicate the high of amphetamines, cocaine, and MDMA.

Bath salts are known to contain mephedrone, MDPV, and methylone, which can trigger neurological and psychiatric effects.